JP2013169289A - Couch with patient tilting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small and inexpensive couch with a patient tilting device.SOLUTION: This couch (10) with a patient tilting device includes: a top plate (28); a pair of second rails (15) disposed below the top plate (28); a second moving section (16) having a pair of second sliders (17) capable of moving on the pair of second rails (15); a pair of block bodies (22) capable of moving on the pair of second rails (15); a drive mechanism (23) for linearly moving the block bodies (22) with respect to the second moving section (16); a support section (26) formed on the second moving section (16) to support the top plate (28); and a lever (27) having one end coupled to the top plate (28) and the other end coupled to the pair of block bodies (22).

Description

  The present invention relates to a couch with a patient tilting device.

2. Description of the Related Art Conventionally, a radiation irradiation apparatus for performing radiation therapy is provided with a couch provided with a bed that moves relative to an isocenter of the radiation irradiation apparatus for the purpose of determining a radiation irradiation position for a patient.
Such a couch is provided with a device for tilting the patient on the bed for the purpose of holding the patient in various postures. For example, Patent Literature 1 discloses a treatment table for a radiation therapy apparatus. The treatment table for a radiation therapy apparatus described in Patent Literature 1 can horizontally move a patient along three axes orthogonal to each other.
Patent Document 2 discloses a device that can rotate and move a patient around each of the three axes in addition to the horizontal movement along the three axes.

JP 2006-51215 A US Pat. No. 7,373,676

In order to irradiate an appropriate part of a patient with radiation, it is preferable that the position and angle at which the patient is irradiated with radiation is highly flexible, and horizontal movement and rotation as described in Patent Document 2 above. It is preferable that there is a 6-axis degree of freedom combined with movement. However, a couch having six degrees of freedom may increase in height or increase in manufacturing cost due to an increase in the number of parts.
This invention is made | formed in view of the said situation, and is providing the couch with a patient tilting apparatus small and low-cost.

  The couch with a patient tilt device of the present invention is movable on a top plate on which a subject is placed, a pair of rails arranged along one direction below the top plate, and the pair of rails. A moving part having a pair of sliders, a pair of block bodies movable on the pair of rails, a drive mechanism for linearly moving the block body in the one direction with respect to the moving part, and provided in the moving part And a lever having one end connected to the top plate and the other end connected to the pair of block bodies, and the drive mechanism includes the pair of block bodies. And a second drive mechanism for moving the other of the pair of block bodies with respect to the moving portion, and the lever includes the pair of blocks. Provided on the one side of the block body One lever and a second lever provided on the other of the pair of block bodies, wherein the one end of the first lever and the one end of the second lever are the support portions of the top plate. Is a couch with a patient tilting device that is connected to the top plate at different positions and different positions.

  In addition, at least one of the first drive mechanism and the second drive mechanism includes a rod-like screw portion extending in parallel with the rail and having a thread formed on an outer surface thereof, and the screw portion provided on the block body. A nut portion that is screwed together, and the block portion may be moved relative to the moving portion by rotating the screw portion relative to the nut portion around an axis.

  In addition, the support portion may connect the moving portion and the top plate so that the top plate can be rotated with respect to the moving portion around a predetermined rotation center.

  Further, a joint having a degree of freedom of two or more axes may be provided on at least one of the one end and the other end of the lever.

  The couch with a patient tilting device of the present invention is small and low cost.

It is a perspective view which shows the couch with a patient tilting apparatus of one Embodiment of this invention. It is a side view which shows the structure of a part of the couch. FIG. 3 is an enlarged view of a part of FIG. 2. It is a top view which shows a part of the couch typically. It is a figure for demonstrating the operation | movement at the time of use of the couch. It is a figure for demonstrating the operation | movement at the time of use of the couch.

  A couch 10 with a patient tilt device according to an embodiment of the present invention will be described with reference to the drawings. It is a perspective view which shows the radiotherapy system 1 provided with the couch 10 with a patient tilting apparatus of this embodiment. FIG. 2 is a side view showing a partial configuration of the couch 10 with the patient tilting device. FIG. 3 is an enlarged view of a part of FIG. FIG. 4 is a plan view schematically showing a part of the couch 10 with a patient tilting device.

  A couch 10 with a patient tilting device (hereinafter simply referred to as “couch 10”) of this embodiment is applied as a part of a radiation treatment system 1 including a radiation irradiation device 2, for example.

First, a schematic configuration of the radiation therapy system 1 will be described.
As shown in FIG. 1, a radiation therapy system 1 includes a radiation irradiation device 2 that irradiates a patient while moving around the patient, a CT device 6 for performing X-ray CT (computed tomography) examination, The couch 10 of this embodiment is provided.
The radiation irradiation apparatus 2 includes a base part 3, a gantry 4 that is provided on the base part 3 and rotates around a rotation center, and an irradiation part 5 provided on the gantry 4. The CT apparatus 6 is attached to the gantry 4.
The gantry 4 is rotatable relative to the base unit 3 and is set so that the vicinity of the rotation center of the gantry 4 is an isocenter in the irradiation unit 5.

Next, the couch 10 of this embodiment will be described.
The couch 10 includes a lifting device 11 fixed to the floor on which the radiation therapy system 1 is installed, a slide device 12 and a tilting device 21 attached to the lifting device 11, and a top plate 28 connected to the tilting device 21. It has.

  The lifting device 11 is a device that moves the slide device 12, the tilting device 21, the tilting device 21, and the top plate 28 forward and backward in a direction perpendicular to the floor surface.

  The slide device 12 is a device provided for the purpose of moving the tilting device 21 in the horizontal direction, which is disposed at the upper end of the lifting device 11. As shown in FIGS. 2 to 4, the slide device 12 is provided on a pair of first rails 13, a first moving unit 14 that travels on the pair of first rails 13, and an upper surface of the first moving unit 14. The pair of second rails 15 and the second moving unit 16 that travels on the pair of second rails 15 are provided.

  The pair of first rails 13 are arranged at two locations that are separated from each other on the upper end surface of the lifting device 11. Each rail which comprises a pair of 1st rail 13 is mutually extended in parallel. Between each rail which comprises a pair of 1st rail 13, the 1st rack (all are not shown) with which the 1st pinion gear provided in the 1st moving part 14 meshes is arrange | positioned.

  The first moving unit 14 travels on the first rail 13 by a rack and pinion mechanism.

  The pair of second rails 15 are arranged along one direction orthogonal to the pair of first rails 13. As shown in FIG. 4, the rails constituting the pair of second rails 15 extend in parallel with each other. Between each rail which comprises a pair of 2nd rail 15, the 2nd rack 18 which the 2nd pinion gear 19 mentioned later provided in the 2nd moving part 16 meshes is arrange | positioned.

  As shown in FIGS. 3 and 4, the second moving portion 16 has a pair of second sliders 17 that are slidably attached to the rails that constitute the pair of second rails 15. The second slider 17 is disposed at two positions for each rail constituting the pair of second rails 15. That is, in the present embodiment, a total of four second sliders 17 are attached to the pair of second rails 15. Further, the second moving portion 16 is provided with a second motor portion 20 to which a second pinion gear 19 that meshes with the second rack 18 is attached. The second motor unit 20 drives the second pinion gear 19 to rotate by a control unit (not shown). When the second pinion gear 19 is rotationally driven, the second moving unit 16 travels on the second rail 15.

  The tilting device 21 includes a pair of block bodies 22 that can move on the rails constituting the pair of second rails 15, a drive mechanism 23 that linearly moves each block body 22 with respect to the second moving unit 16, A support portion 26 for supporting the plate 28 and a lever 27 connected to the top plate 28 and the block body 22 are provided.

  The block body 22 is a member that can move in the direction in which the second rail 15 extends by traveling on the second rail 15, and movement in a direction that intersects with the direction in which the second rail 15 extends is restricted. . One block body 22 is provided for each rail constituting the pair of second rails 15. The two block bodies 22 travel on the second rail 15 independently of each other by the drive mechanism 23.

  The drive mechanism 23 includes a first drive mechanism 23A that moves one of the pair of block bodies 22 (block body 22A) with respect to the second moving unit 16, and a second block body 22B that is the other of the pair of block bodies 22 (block body 22B). A second drive mechanism 23 </ b> B that is moved with respect to the moving unit 16.

  The first drive mechanism 23A includes a rod-like screw portion 24A that extends parallel to the second rail 15 and has a thread formed on the outer surface thereof, and a nut portion 25A that is provided on the block body 22A and into which the screw portion 24A is screwed. ing. When the screw portion 24A rotates relative to the nut portion 25A around the axis, the block body 22A moves relative to the moving portion.

  The second drive mechanism 23B includes a rod-like screw portion 24B extending in parallel with the second rail 15 and having a thread formed on the outer surface thereof, and a nut portion 25B provided on the block body 22B and into which the screw portion 24B is screwed. ing. When the screw part 24B rotates relative to the nut part 25B around the axis, the block body 22B moves relative to the moving part.

  The support unit 26 is provided in the second moving unit 16 and supports the top plate 28 so that the top plate 28 can swing with respect to the second moving unit 16. In the present embodiment, the support portion 26 is connected by a ball joint, and the top plate 28 rotates with respect to the second moving portion 16 around the rotation center of the ball joint.

  As shown in FIG. 3, the lever 27 includes a first lever 27A provided on one of the pair of block bodies 22 (block body 22A) and a second lever provided on the other of the pair of block bodies 22 (block body 22B). And two levers 27B. Since the configuration of the first lever 27A and the second lever 27B is common, only the configuration of the first lever 27A will be described with respect to the parts having the same configuration.

  The first lever 27A has one end connected to the top plate 28 and the other end connected to the block body 22A. The first lever 27A is a rod-like member having joints with two or more degrees of freedom at both ends. For example, a universal joint or a ball joint is provided at both ends of the first lever 27A. For this reason, the first lever 27A is swingably connected to the block body 22A and the top plate 28. The length of the first lever 27A in the axial direction is longer than the distance between the lower surface of the top plate 28 and the second rail 15 when the top plate 28 is in a horizontal state.

  The second lever 27B has one end connected to the top plate 28 and the other end connected to the block body 22B. The structure of both ends of the second lever 27B and the length of the second lever 27B are the same as those of the first lever 27A.

  One end of the first lever 27A (the end connected to the top plate 28) and one end of the second lever 27B (the end connected to the top plate 28) are connected to the support portion 26 of the top plate 28. Are connected to the top plate 28 at different positions and at different positions.

  The top plate 28 has a substantially flat plate shape and is supported by the support portion 26, the first lever 27, and the second lever 27 at three different points. The top surface of the top plate 28 is a bed on which a patient (subject) is placed.

Next, the effect | action of the couch 10 of this embodiment is demonstrated. 5 and 6 are diagrams for explaining an operation when the couch 10 is used.
When the couch 10 is used, the patient is placed on a bed provided on the top board 28. The posture of the patient is set to an appropriate posture for irradiating radiation, and is held in an appropriate posture by a holder or the like (not shown) as necessary.

  Thereafter, the couch 10 is driven by the elevating device 11, the slide device 12, and the tilting device 21 so that the position where radiation is to be irradiated to the patient coincides with the isocenter.

  The elevating device 11 shown in FIG. 1 is used for the purpose of adjusting the position in the vertical direction with respect to the radiotherapy device. The slide device 12 is used for the purpose of adjusting the insertion depth of the patient into the gantry 4 and adjusting the horizontal position of the top plate 28 in the gantry 4. The tilting device 21 is used for the purpose of adjusting the tilt angle of the top plate with respect to the horizontal direction.

  As shown in FIGS. 5 and 6, the tilting device 21 holds the top plate 28 horizontally in the initial state. When the top plate 28 is inclined from the horizontal direction in the gantry 4 shown in FIG. 1, either or both of the first drive mechanism 23A and the second drive mechanism 23B are driven.

  As shown in FIGS. 5 and 6, for example, when the screw portion 24 </ b> A is rotated around the axis, the distance of the block body 22 </ b> A to the second moving portion 16 in the direction in which the second rail 15 extends changes. Here, when the second moving unit 16 is stationary on the second rail 15, the block body 22 </ b> A moves on the second rail 15 with respect to the second moving unit 16. Since the block body 22A and the top plate 28 are connected by the first lever 27A, the inclination of the first lever 27A changes according to the moving direction and the moving amount of the block body 22 along the second rail 15.

  For example, as shown in FIG. 5, when the block body 22A moves so that the block body 22A approaches the connecting portion between the one end of the first lever 27A and the top plate 28, the inclination angle of the first lever 27A increases, The top plate 28 is pushed up by one lever 27A. On the contrary, as shown in FIG. 6, when the block body 22A moves so that the block body 22A moves away from the connecting portion between the one end of the first lever 27A and the top plate 28, the inclination angle of the first lever 27A becomes small, The top plate 28 is pulled down by the first lever 27A.

  Although illustration is omitted, the screw portion 24B is rotated around the axis by the same action, whereby the distance of the block body 22B with respect to the second moving portion 16 is changed, and the top plate 28 is pushed up or down. .

  In the present embodiment, since one end of the first lever 27A and one end of the second lever 27B move relative to each other with the support portion 26 as a fulcrum, the top plate 28 is inclined in a desired direction with the support portion 26 as the rotation center. To do. For example, the top plate 28 is rotated with respect to the second moving unit 16 with the axis parallel to the second rail 15 as the rotation center, or with respect to the second moving unit 16 with the axis orthogonal to the second rail 15 as the rotation center. The top plate 28 can be rotated.

  As described above, the lifting device 11, the sliding device 12, and the tilting device 21 operate, so that the patient can be placed in the gantry 4 at an appropriate position and angle. Then, by irradiating with radiation from the irradiation unit 5, the radiation is irradiated toward the isocenter, and the patient is irradiated with radiation at a position where the patient is scheduled to be irradiated.

  Thus, according to the couch 10 of the present embodiment, the inclination angle of the lever 27 changes as the block body 22 travels on the pair of second rails 15 disposed below the top plate 28. The tilting device 21 can be accommodated in the space between the two rails 15 and the top plate 28. Thereby, the couch 10 can be made small.

  In addition, since the second slider 17 and the block body 22 share the second rail 15, the number of parts is reduced as compared with the case where rails are provided for the second slider 17 and the block body 22, respectively.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

For example, in the above-described embodiment, the case where a patient is placed has been described, but the subject placed on the couch top is not limited to a person. For example, the target placed on the couch top may be an animal other than a human being or an inanimate object.
Further, instead of having joints with two or more degrees of freedom at both ends of the first lever and the second lever, a twist may be absorbed by a rubber bush. Further, the joint having two or more degrees of freedom may be provided only in one of the end portions of the first lever and the second lever.
The first lever and the second lever may be extendable.

  In addition, the design change etc. with respect to the above-mentioned embodiment are not limited to the said matter.

  The couch with a patient tilting device of the present invention can be suitably applied to a couch that requires strict alignment, such as when irradiating a treatment target site in a patient (subject).

DESCRIPTION OF SYMBOLS 1 Radiotherapy system 2 Radiation irradiation apparatus 3 Base part 4 Gantry 5 Irradiation part 6 Apparatus 10 Couch 11 Lifting apparatus 12 Slide apparatus 13 1st rail 14 1st moving part 15 2nd rail 16 2nd moving part 17 2nd slider 18 Second rack 19 Second pinion gear 20 Second motor part 21 Tilt device 22 Block body 23 Drive mechanism 24A Screw part 24B Nut part 25A Screw part 25B Nut part 26 Support part 27 Lever 27A First lever 27B Second lever 28 Top plate

Claims (4)

A top plate on which the subject is placed;
A pair of rails arranged along one direction below the top plate,
A moving part having a pair of sliders movable on the pair of rails;
A pair of block bodies movable on the pair of rails;
A drive mechanism for linearly moving the block body in the one direction with respect to the moving unit;
A support portion provided in the moving portion and supporting the top plate;
A lever having one end connected to the top plate and the other end connected to the pair of block bodies;
With
The drive mechanism is
A first drive mechanism for moving one of the pair of block bodies relative to the moving unit;
A second drive mechanism for moving the other of the pair of block bodies relative to the moving part;
Have
The lever is
A first lever provided on the one of the pair of block bodies;
A second lever provided on the other of the pair of block bodies;
Have
The one end of the first lever and the one end of the second lever are at positions different from the support portion of the top plate and connected to the top plate at positions different from each other. . A couch with a patient tilt device according to claim 1,
At least one of the first drive mechanism and the second drive mechanism is:
A rod-like threaded portion extending parallel to the rail and having a thread formed on the outer surface;
A nut portion provided in the block body and screwed with the screw portion;
With
A couch with a patient tilting device that moves the block body relative to the moving portion by rotating the screw portion relative to the nut portion around an axis. A couch with a patient tilt device according to claim 1,
The support portion is a couch with a patient tilting device that connects the moving portion and the top plate so that the top plate can rotate with respect to the moving portion around a predetermined rotation center. A couch with a patient tilt device according to claim 1,
A couch with a patient tilt device in which at least one of the one end and the other end of the lever is provided with a joint having two or more degrees of freedom.

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